package com.mmall.service.impl;

import com.mmall.common.Const;
import com.mmall.common.ServerResponse;
import com.mmall.common.TokenCache;
import com.mmall.dao.UserMapper;
import com.mmall.pojo.User;
import com.mmall.service.IUserService;
import com.mmall.util.MD5Util;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


import java.util.UUID;

//把service注入到控制层用
@Service("iUserService")
public class UserServiceImplTest implements IUserService{

    @Autowired
    private UserMapper userMapper;

    @Override
    public ServerResponse<User> login(String username, String password) {
        int resultCount = userMapper.checkUsername(username);
        if (resultCount == 0){
            return ServerResponse.createByErrorMessage("用户不存在");
        }
        //to do 密码登录md5
        String passwordMD5 = MD5Util.MD5EncodeUtf8(password);
        User user = userMapper.selectLogin(username,passwordMD5);
        if (user == null){
            return ServerResponse.createByErrorMessage("密码错误");
        }
        //把密码设为空防止传递时出现密码泄露
        user.setPassword(org.apache.commons.lang3.StringUtils.EMPTY);
        return ServerResponse.createBySuccess("登录成功",user);
    }

    public ServerResponse<String> register(User user){
        ServerResponse validResponse = this.checkValid(user.getUsername(),Const.USERNAME);
        if (!validResponse.isSuccess()){
            return  validResponse;
        }
        validResponse = this.checkValid(user.getEmail(),Const.EMAIL);
        if (!validResponse.isSuccess()){
            return  validResponse;
        }
        int resultCount = userMapper.insert(user);
        if (resultCount == 0){
            return  ServerResponse.createByErrorMessage("注册失败");
        }
        return  ServerResponse.createBySuccessMessage("注册成功");
    }

    public ServerResponse<String> checkValid(String string, String type){
        if (org.apache.commons.lang3.StringUtils.isNotBlank(type)){
            //开始校验
            if (Const.USERNAME.equals(type)){
                int resultCount = userMapper.checkUsername(string);
                if (resultCount > 0){
                    return ServerResponse.createByErrorMessage("用户名已经存在");
                }
            }
            if (Const.EMAIL.equals(type)){
               int resultCount = userMapper.checkEmail(string);
                if (resultCount > 0){
                    return  ServerResponse.createByErrorMessage("此邮箱已被注册！");
                }
            }
        }else {
            return ServerResponse.createByErrorMessage("参数错误");
        }
        return  ServerResponse.createBySuccessMessage("校验成功");
    }
    //查找密码
    public ServerResponse<String> selectQuestion(String username){
        ServerResponse validResponse = this.checkValid(username,Const.USERNAME);
        if (validResponse.isSuccess()){
            //用户名不存在
            return  ServerResponse.createByErrorMessage("用户名不存在");
        }
        String question = userMapper.selectQuestionByUsername(username);
        if (org.apache.commons.lang3.StringUtils.isNotBlank(question)){
            return ServerResponse.createBySuccess(question);
        }
        return ServerResponse.createByErrorMessage("找回密码的问题为空");
    }

    public ServerResponse<String> checkAnswer(String username,String question,String answer){
        int resultCount = userMapper.checkAnswer(username,question,answer);
        if (resultCount > 0){
            //说明这个问题和答案是和这个用户的，并且是争取的
            String forgetToken = UUID.randomUUID().toString();
            TokenCache.setKey(TokenCache.TOKEN_PREFIX+username,forgetToken);
            return ServerResponse .createBySuccess(forgetToken);
        }
        return ServerResponse.createByErrorMessage("问题的答案是错的");
    }

    public ServerResponse<String> forgetResetPassword(String username,String passwordNew,String forgetToken){
        if (org.apache.commons.lang3.StringUtils.isBlank(forgetToken)){
            return  ServerResponse.createByErrorMessage("token错误，需要传递");
        }
        ServerResponse validResponse = this.checkValid(username,Const.USERNAME);
        if (validResponse.isSuccess()){
            //用户名不存在
            return  ServerResponse.createByErrorMessage("用户名不存在");
        }
        String token = TokenCache.getKey(TokenCache.TOKEN_PREFIX+username);
        if (org.apache.commons.lang3.StringUtils.isBlank(token)){
            return ServerResponse.createByErrorMessage("token无效或过期");
        }
        if (org.apache.commons.lang3.StringUtils.equals(forgetToken,token)){
            String md5Password = MD5Util.MD5EncodeUtf8(passwordNew);
            int resultCount = userMapper.updatePasswordByUsername(username,md5Password);
            if (resultCount > 0){
                return ServerResponse.createBySuccessMessage("修改密码成功");
            }
        }else {
            return ServerResponse.createByErrorMessage("获取token失败，请重新获取");
        }
        return ServerResponse.createByErrorMessage("修改密码失败");
    }

    public ServerResponse<String> resetPassword(String passwordOld,String passwordNew,User user){
        //防止横向越权，要校验一下这个用户的旧密码，一定要指定是这个用户，
        // 因为我们会查询一个count（1），如果不指定id，那么结果就是ture了count>0
        int resultCount = userMapper.checkPassword(MD5Util.MD5EncodeUtf8(passwordOld),user.getId());
        if (resultCount == 0){
            return ServerResponse.createByErrorMessage("旧密码错误");
        }
        int updateCount = userMapper.updateByPrimaryKeySelective(user);
        if (updateCount > 0){
            return ServerResponse.createBySuccessMessage("密码更新成功");
        }
        return  ServerResponse.createByErrorMessage("密码更新失败");
    }

    public ServerResponse<User> updateInformation(User user){
        //username不能被更新
        //Email也要进行一个更新，校验新的Email是不是已经存在
        int resultCount = userMapper.checkEmailByUserId(user.getEmail(),user.getId());
        if (resultCount > 0){
            return  ServerResponse.createByErrorMessage("Email已经存在，请更换Email再重试");
        }
        User updateUser = new User();
        updateUser.setId(user.getId());
        updateUser.setEmail(user.getEmail());
        updateUser.setPhone(user.getPhone());
        updateUser.setQuestion(user.getQuestion());
        updateUser.setAnswer(user.getAnswer());

        int updateCount = userMapper.updateByPrimaryKeySelective(updateUser);
        if (updateCount > 0){
            return ServerResponse.createBySuccess("更新成功",updateUser);
        }
        return  ServerResponse.createByErrorMessage( "g更新个人信息失败");
    }

    public ServerResponse<User> getInformation(Integer userId){
        User user = userMapper.selectByPrimaryKey(userId);
        if (user == null){
            return ServerResponse.createByErrorMessage("找不到当前用户");
        }
        user.setPassword(StringUtils.EMPTY);
        return ServerResponse.createBySuccess(user);
    }
}
